Creating Outlines

Webspiration Classroom - From the creators of Inspiration, a wonderful graphic organizer that now allows for online collaboration. One of the best visual outline creators on the web.
Quicklyst - A free user friendly site for creating outlines. Quicklist also integrates with a search engine and dictionary for enhanced note taking. Study queues can be made as well.
Knowcase - Create collaborative outlines with this easy-to-use site that features a drag-n-drop interface.
Thinklinkr - A real-time collaborative outline creator that has a nice built-in chat feature to engage in project development.
Checkvist - A great collaborative online outliner that has an abundance of features such as: gmail/browser integration, mobility, and nice import/export features.
CRLS Outline Maker - Takes users through a step-by-step process to create an outline.
Read Write & Think Outline Maker - A very easy-to-use outline creator that teaches how to create outlines.
Loose Stitch - A nice fun site for creating collaborative outlines that can the be exported to a blog or website.
Wisemapping - More of a mindmapper than pure outline creator, but still a great visual site that teaches the basic concepts of creating an outline.
Mindmeister - A fun site for real-time collaboration that is ideal for creating brainstorms, mind maps, and outlines